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RELATED PARTY TRANSACTIONS - Transactions with Other Affiliates of Geveran (Details) - Related party - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |
Related party expenses | $ (4,420) | $ (4,560) | $ (4,305)
Related party revenue | 311 | 28 | 7
Seatankers Management Co. Ltd |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | (115) | (225) | (144)
Front Ocean Management AS |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | (400) | (226) | (55)
Frontline Management (Bermuda) Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | (128) | (272) | (288)
Front Ocean Management Ltd |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | (257) | (258) | 0
Golden Ocean Management AS |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 0 | 0 | (1)
Flex LNG Fleet Management AS |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | (3,435) | (3,489) | (3,235)
Seatankers Management Norway AS |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | (85) | (58) | (59)
Frontline plc |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 0 | 0 | (2)
Frontline Management AS |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 0 | 0 | (184)
Related party revenue | 0 | 10 | 0
FS Maritime SARL |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 0 | (32) | (337)
Northern Ocean Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Related party revenue | 0 | 6 | 7
Avance Gas Holdings Ltd |  |  |
Related Party Transaction [Line Items] |  |  |
Related party revenue | 293 | 4 | 0
Sloane Square Capital Holdings Ltd |  |  |
Related Party Transaction [Line Items] |  |  |
Related party revenue | 9 | 8 | 0
Paratus Management (UK) Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Related party revenue | 5 | 0 | 0
Seatankers Services (UK) LLP |  |  |
Related Party Transaction [Line Items] |  |  |
Related party revenue | $ 4 | $ 0 | $ 0

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